Knitting Machine Drill Adapter for Sentro

A simple adapter for turning a Sentro 46 needle knitting machine with a power drill or screwdriver.
It shouldn't need rescaling unless you have a different machine or know your printer's peculiarities better than I do!

You will need a 1/4" hex (i.e. standard hex bit) to 3/8" socket ('square drive') adapter, purchasable online or at a Hardware store for about $3. I attached a picture for good measure.